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From Karnataka Open Educational Resources
10,621 bytes added ,  05:56, 9 October 2020
Created page with "-- This module is intended for processing of date strings. Please do not modify this code without applying the changes first at Module:Date/sandbox and testing at Modu..."
--[[

This module is intended for processing of date strings.

Please do not modify this code without applying the changes first at Module:Date/sandbox and testing
at Module:Date/sandbox/testcases and Module talk:Date/sandbox/testcases.

Authors and maintainers:
* User:Parent5446 - original version of the function mimicking template:ISOdate
* User:Jarekt - original version of the functions mimicking template:Date and template:ISOyear

]]


local p = {}

-- =======================================
-- === Dependencies ======================
-- =======================================
local i18n = require('Module:I18n/date') -- get localized translations of date formats
local Fallback = require('Module:Fallback') -- get fallback functions
local yesno = require('Module:Yesno')

--[[
Date

This function is the core part of the ISOdate template.

Usage:
{#invoke:Date|Date|year=|month=|day=|hour=|minute=|second=|lang=en}}

Parameters:
year,month,day,hour,minute,second: broken down date-time component strings
lang: The language to display it in
case: Language format (genitive, etc.) for some languages
class: CSS class for the <time> node, use "" for no metadata at all

Error Handling:

]]
function p.Date(frame)
local args = frame.args
if not (args.lang and mw.language.isSupportedLanguage(args.lang)) then
args.lang = frame:callParserFunction( "int", "lang" ) -- get user's chosen language
end
return p._Date(
{
args.year or '',
args.month or '',
args.day or '',
args.hour or '',
args.minute or '',
args.second or ''
},
args.lang, -- language
args.case or '', -- allows to specify grammatical case for the month for languages that use them
args.class or 'dtstart', -- allows to set the html class of the time node where the date is included. This is useful for microformats.
args.trim_year or '100-999' -- by default pad one and 2 digit years to be 4 digit long, while keeping 3 digit years as is
)
end


function p._Date(datevec, lang, case, class, trim_year)
-- make sure inputs are in the right format
if #datevec<6 then
for i=#datevec,6,1 do datevec[i]='' end
end
if not case then case = '' end
if not class then class = '' end
if not trim_year then trim_year = '100-999' end

-- if language is not provided than look up users language
-- WARNING: This step should be done by the template as it does not seem to work as well here (cache issues?)
if not lang or not mw.language.isValidCode( lang ) then
lang = 'en'
end

-- Just in case someone broke the internationalization code than fix the english defaults
if i18n.DateLang['en'] == nil then
i18n.DateLang['en'] = 'en-form'
end
if i18n.DateFormat['en-form'] == nil then
i18n.DateFormat['en-form'] = {YMDHMS='j F Y, H:i:s', YMDHM='j F Y, H:i', YMD='j F Y', YM='F Y', MD='j F', Y='Y'}
end

-- create datecode based on which variables are provided and check for out of bound values
local maxval = {9999, 12, 31, 23, 59, 60} -- max values for year, month, ...
local c = {'Y', 'M', 'D', 'H', 'M', 'S'}
local datecode = '' -- a string signifying which combination of variables was provided
local datenum = {} -- date-time encoded as a vector = [year, month, ... , second]
for i, v in ipairs( datevec ) do
if v~=nil and v~='' then
datecode = datecode .. c[i]
datenum[i] = tonumber(v)
if datenum[i]==nil and i==2 then
-- month is not a number -> check if it is a month name in English
v = mw.language.new('en'):formatDate( "n", v)
datenum[i] = tonumber(v)
end
if datenum[i]==nil or datenum[i]>maxval[i] then
-- Some numbers are out of range -> abort and return the empty string
return ''
end
end
end

-- create time stamp string (for example 2000-02-20 02:20:20) based on which variables were provided
local timeStamp
if datecode == 'YMDHMS' then
timeStamp = string.format('%04i-%02i-%02i %02i:%02i:%02i', datenum[1], datenum[2], datenum[3], datenum[4], datenum[5], datenum[6] )
elseif datecode == 'YMDHM' then
timeStamp = string.format('%04i-%02i-%02i %02i:%02i', datenum[1], datenum[2], datenum[3], datenum[4], datenum[5] )
elseif datecode:sub(1,3)=='YMD' then
timeStamp = string.format('%04i-%02i-%02i', datenum[1], datenum[2], datenum[3] )
datecode = 'YMD' -- 'YMD', 'YMDHMS' and 'YMDHM' are the only supported format starting with 'YMD'. All others will be converted to 'YMD'
elseif datecode == 'YM' then
timeStamp = string.format('%04i-%02i', datenum[1], datenum[2] )
elseif datecode:sub(1,1)=='Y' then
timeStamp = string.format('%04i', datenum[1] )
datecode = 'Y'
elseif datecode == 'M' then
timeStamp = string.format('%04i-%02i-%02i', 2000, datenum[2], 1 )
class = '' -- date not complete -> no html formating or micro-tagging of date string
elseif datecode == 'MD' then
timeStamp = string.format('%04i-%02i-%02i', 2000, datenum[2], datenum[3] )
class = '' -- date not complete -> no html formating or micro-tagging of date string
else
return '' -- format not supported
end

-- ==========================================================
-- === Create Date String using in chosen language
-- ==========================================================

-- which form should the date take?
-- Use Fallback module to handle rare languages which are more likely to use different for than default EN form
local langDateForm = Fallback._langSwitch(i18n.DateLang, lang)

-- special case of French and Gallic dates, which require different date format for the 1st day of the month
if datenum[3]==1 and (langDateForm=='fr-form' or langDateForm=='ga-form') then
langDateForm = langDateForm .. '1' -- ordinal form for the first day of the month
end
-- special case of Basque dates, which require different date format for the 1st, 11th, 21st and 31st day of the month
if langDateForm=='eu-form' then
if (datenum[3]==1 or datenum[3]==21) then
langDateForm = 'eu-form01'
elseif (datenum[3]==11 or datenum[3]==31) then
langDateForm = 'eu-form11'
end
end

-- Look up country specific format input to {{#time}} function
local dFormat = i18n.DateFormat[langDateForm][datecode]

-- overwrite default grammatical case of the month (applies mostly to Slavic languages)
if (case=='gen') then
-- CAUTION: at the moment i18n.DateFormat uses "F" only as month name, but this might change and this operation does not check if 'F' is in "" brackets or not, so if some language starts using 'F' in "" than this will not work for that language
dFormat = dFormat:gsub("F", "xg");
end
if (case=='nom') then
-- CAUTION: at the moment i18n.DateFormat uses "xg" only as month name, but this might change and this operation does not check if 'xg' is in "" brackets or not, so if some language starts using 'xg' in "" than this will not work for that language
dFormat = dFormat:gsub("xg", "F");
end
if ((lang=='ru' or lang=='pl' or lang=='cs' or lang=='sl' or lang=='sk') and (case=='loc' or case=='ins')) or
(lang=='fi' and (case=='ptv' or case=='ine'or case=='ela'or case=='ill') ) then
local monthEn = mw.language.new('en'):formatDate( "F", timeStamp) -- month name in English
-- month name using proper case and language. It relies on messages stored in MediaWiki namespace for some cases and languages
-- That is why this IF statement uses "lang" not "langDateForm" variable to decide
local monthMsg = mw.message.new( string.format('%s-%s', monthEn, case ) ):inLanguage( lang )
if not monthMsg:isDisabled() then -- make sure it exists
local month=monthMsg:plain()
dFormat = dFormat:gsub('F', '"'..month..'"'); -- replace default month with month name we already looked up
dFormat = dFormat:gsub('xg', '"'..month..'"');
end
end
-- Special case related to Quechua and Kichwa languages
-- see https://commons.wikimedia.org/wiki/Template_talk:Date#Quechua from 2014
if (lang=='qu' or lang=='qug') and case=='nom' then
dFormat = dFormat:gsub('F"pi"', 'F');
end

-- Lua only date formating using {{#time}} parser function (new)
-- prefered call which gives "Lua error: too many language codes requested." on the [[Module talk:Date/sandbox/testcases]] page
--local datestr = mw.language.new(lang):formatDate( dFormat, timeStamp)
local datestr = mw.getCurrentFrame():callParserFunction( "#time", { dFormat, timeStamp, lang } )

-- Another special case related to Thai solar calendar
if lang=='th' and datenum[1]~= nil and datenum[1]<=1940 then
-- As of 2014 {{#time}} parser function did not resolve those cases properly
-- See https://en.wikipedia.org/wiki/Thai_solar_calendar#New_year for reference
-- Disable once https://bugzilla.wikimedia.org/show_bug.cgi?id=66648 is fixed
if datecode=='Y' then -- date is ambiguous
datestr = string.format('%04i หรือ %04i', datenum[1]+542, datenum[1]+543 )
elseif datenum[2]<=3 then -- year is wrong (one too many)
datestr = datestr:gsub( string.format('%04i', datenum[1]+543), string.format('%04i', datenum[1]+542 ) )
end
end

-- If year<1000 than either keep it padded to the length of 4 digits or trim it
-- decide if the year will stay padded with zeros (for years in 0-999 range)
if datenum[1]~= nil and datenum[1]<1000 then
local trim = yesno(trim_year,nil)
if trim == nil then
local YMin, YMax = trim_year:match( '(%d+)-(%d+)' )
trim = (YMin~=nil and datenum[1]>=tonumber(YMin) and datenum[1]<=tonumber(YMax))
end

-- If the date form isn't the Thai solar calendar, don't zero pad years in the range of 100-999.
-- If at some point support for Islamic/Hebrew/Japanese years is added, they may need to be skipped as well.
if trim then
--local yearStr1 = mw.language.new(lang):formatDate( 'Y', timeStamp)
local yearStr1 = mw.getCurrentFrame():callParserFunction( "#time", { 'Y', timeStamp, lang } )
--local yearStr1 = datestr:match( '%d%d%d%d' ) -- 4 digits in a row (in any language) - that must be a year
local yearStr2 = yearStr1
local zeroStr = mw.ustring.sub(yearStr1,1,1)
for i=1,3 do -- trim leading zeros
if mw.ustring.sub(yearStr2,1,1)==zeroStr then
yearStr2 = mw.ustring.sub(yearStr2, 2, 5-i)
else
break
end
end
datestr = datestr:gsub( yearStr1, yearStr2 )
--datestr = string.format('%s (%s, %s)', datestr, yearStr1, yearStr2 )
end
end

-- html formating and tagging of date string
if class ~= '' then
local DateHtmlTags = '<span style="white-space:nowrap"><time class="%s" datetime="%s">%s</time></span>'
datestr = DateHtmlTags:format(class, timeStamp, datestr)
end
return datestr
end

return p
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